Differential cross sections for low-energy elastic electron scattering from tetrahydrofuran in the angular range 20°–180°

Absolute differential cross sections have been measured for elastic electron scattering from tetrahydrofuran in the electron impact energy from $6\text{to}20\mathrm{eV}$ and in a wide scattering angle range from 20° to 180°. In the measurements the magnetic-angle-changing technique has been employed to detect the backward scattering of electrons. The integral and momentum transfer cross sections for elastic scattering have been also determined through integration of the measured differential cross sections. A detailed comparison of the obtained differential cross sections has been made with the results of very recent theoretical calculations. In the measurements attention has been paid to observe negative-ion resonances predicted in these theoretical calculations.

Figure 1

(Color online) Diagrams of the ground-state equilibrium structures of tetrahydrofuran, ${\mathrm{C}}_4{\mathrm{H}}_8\mathrm{O}$, in the (a) $C_2$ (twisted geometry) and (b) $C_s$ (envelope geometry) point symmetry groups. Oxygen atom is red (dark), carbon atom gray (gray), and hydrogen atom green (dark gray).

Figure 2

(Color online) Differential cross sections for elastic electron scattering in tetrahydrofuran at the energy of (a) $6\mathrm{eV}$, (b) $7\mathrm{eV}$, (c) $8\mathrm{eV}$, and (d) $10\mathrm{eV}$: (●) present results. In the figures are shown experimental results of Colyer et al. [14] and theoretical results of Trevisan et al. [21] and Winstead and McKoy [22].

Figure 3

(Color online) Differential cross sections for elastic electron scattering in tetrahydrofuran at the energy of (a) $12\mathrm{eV}$, (b) $15\mathrm{eV}$, and (c) $20\mathrm{eV}$: (●) present results. In the figures are shown experimental results of Milosavljević et al. [13] and Colyer et al. [14] and theoretical results of Trevisan et al. [21], Winstead and McKoy [22], and Blanco and Garcia [36].

Figure 4

(Color online) Differential cross sections for elastic electron scattering in tetrahydrofuran in the energy range from $4.5\mathrm{eV}\text{to}11\mathrm{eV}$ and at the scattering angles of 60°, 80°, and 150°. The squares show absolute values of the differential cross sections obtained at 80° in the measurements at fixed electron energies.

Figure 5

(Color online) Integral cross sections for elastic electron scattering in tetrahydrofuran: (●) present results. In the figure are shown experimental results of Colyer et al. [14], total cross section results of Zecca et al. [15] and Możejko et al. [16], and theoretical results of Winstead and McKoy [22] and Tonzani and Greene [23].

Figure 6

(Color online) Momentum transfer cross sections in tetrahydrofuran: (●) present results. In the figure are shown experimental results of Colyer et al. [14] and theoretical results of Trevisan et al. [21] and Winstead and McKoy [22].